How to cloth sculpt with collisions
Select collider object (sphere) and under Physics Properties enable Collision



Select cloth object (plane), switch to Sculpt mode, take Cloth Filter brush and go to
3Dview editor &gt; Properties panel (N) &gt; Tool tab &gt; Active Tool &gt; Use Collision


or with Cloth brush go to
3Dview editor &gt; Properties panel (N) &gt; Tool tab &gt; Brush Settings &gt; Enable Collision

In video is also for Grab type used smaller Radius and big Simulation Limit.

To get gravity behaviour as seen in video ... go to same Tool properties tab and increase
Options &gt; Gravity &gt; Factor like 0.1